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全封闭气体中夹有水银柱,当温度变化后,会引起水银柱的移动。在定性分析中如何快速判定水银柱的移动方向,学生往往感到束手无策,下面介绍利用P—T图像进行快速判定的方法。一、判定依据在P—T图像中,一定质量的气体发生升温变化时,终态在等容线的上方,则气体收缩;终态在等容线的下方,则气体膨胀。现通过图1作简要说明。一定质量气体温度升高时,由P点所示的初态变化到M、Q、N三点所示的不同的终态。PQ是一条等容线,M点在Q
Closure of the closed gas mercury column, when the temperature changes, will cause the mercury column movement. In the qualitative analysis of how to quickly determine the direction of movement of mercury, students often feel helpless, the following describes the use of P-T images for rapid determination method. First, the decision is based on the P-T image, a certain mass of gas occurs when the temperature changes, the final state above the isometric line, the gas contraction; final state below the isometric line, the gas expansion. Now through Figure 1 for a brief description. When the mass gas temperature rises, the initial state shown by point P changes to the different final state shown by M, Q and N points. PQ is an isometric line, M point in the Q